Re: [Openvortex-dev] Re: Re: [ALSA - driver 0001138]: errors when installing au8820 modules

[Raymond]

Igor Kovalenko wrote:
> Raymond wrote:
> > Igor Kovalenko wrote:
> >
> > > Well, I've not stated the problem clearly enough.
> > > Once set, volume stays as it should. The problem is that
> > > PCM volume is:
> > > 1% - at lowest audible level
> > > 25% - at about 50% audible level
> > > 49% - at about max audible level
> > > 51% - at lowest audible level
> > > 75% - at about 50% audible level
> > > 99% - at about max audible level
> > > - that is what I described as low-high-low-high.
> > > On the other hand, Master volume behaves as expected.
> >
> >
> >
> > What is the value of comment.range of 'PCM Playback Volume' in
> > /etc/asound.state for your STAC9704 (au8820) ?
> >
> >
> > According to 9704SPEC.pdf, it should be '0-31' ( 5 bits ) for STAC9704
> > PCM Out volume.
>
>
>         control.21 {
>                 comment.access 'read write'
>                 comment.type INTEGER
>                 comment.count 2
>                 comment.range '0 - 63'
>                 iface MIXER
>                 name 'PCM Playback Volume'
>                 value.0 21
>                 value.1 21
>         }
>
> Do you mean AC97 is incorrectly reporting 0...63 range?

Try the following patch to log the read/write of ac97 and post the
system log using dmesg. (loading au8820 and alsactl restore)


alsa-driver-1.0.9b/alsa-kernel/pci/au88x0/au88x0_core.c
@@ -2520,6 +2515,7 @@
        vortex_t *card = (vortex_t *) codec->private_data;
        unsigned int lifeboat = 0;

+       printk(KERN_INFO "ac97 write %.2x : %.4x\n",addr,data);
        /* wait for transactions to clear */
        while (!(hwread(card->mmio, VORTEX_CODEC_CTRL) & 0x100)) {
                udelay(100);
@@ -2567,6 +2563,7 @@
                }
        } while ((data & VORTEX_CODEC_ADDMASK) !=
                 (addr << VORTEX_CODEC_ADDSHIFT));
+       printk(KERN_INFO "ac97 read  %.2x : %.4x\n",addr,data &
VORTEX_CODEC_DATMASK);

        /* return data. */
        return (u16) (data & VORTEX_CODEC_DATMASK);